A/c Indicator Light Blinks Then Stops

[ts_hunter]

I have noticed the last few weeks that the A/C indicator light (a snowflake), just blinks 4 or 5 times when I try to turn it on and then it just goes off. Is this something that the 'Auto' mode is doing in the cold weather, or is something broken?

 

'05 Sierra SLT Crew 4x4

[redsled2007]

I think it has to do with the outside temp. I don't recall the exact number, but 54 deg F comes to mind. anything below and the ac pump shouldn't be used. (It's a phyisics thing)

[2004GMC1500CC]

I think it has to do with the outside temp. I don't recall the exact number, but 54 deg F comes to mind. anything below and the ac pump shouldn't be used. (It's a phyisics thing)

Isn't the ac compressor used when the defroster is on? It's a humidity thing.

[hubbycap]

I think it has to do with the outside temp. I don't recall the exact number, but 54 deg F comes to mind. anything below and the ac pump shouldn't be used. (It's a phyisics thing)

 

+1

 

I believe it is temp related. I've noticed the blinking a/c indicator closer to freezing, at least in the 30s. Of course this is strickly based on when I happen to look at the a/c controls and nothing more.

[y2kz71]

is it when you try to put it on recirc with the defrost on?

 

defrost will only take fresh air

[hubbycap]

is it when you try to put it on recirc with the defrost on?

 

defrost will only take fresh air

 

I know what you're talking about with the forced freshair while in defrost. I've noticed the blinking snowflake light when in just ordinary auto mode.

[y2kz71]

is it when you try to put it on recirc with the defrost on?

 

defrost will only take fresh air

 

I know what you're talking about with the forced freshair while in defrost. I've noticed the blinking snowflake light when in just ordinary auto mode.

 

 

hmmm...that is weird then

[CalixEros]

If the outside temperature is below XX degrees (I think low 30s), then the AC won't turn on. This is probably the temperature at the evaporator (I'm guessing it's just above freezing to avoid icing up the coils). If the evap's not making the air colder, it can't take out humidity and won't do anything when turned on. I could be wrong as my profession involves industrial refrigeration, not automobile air conditioning systems...